A power supply control circuit includes a main controller, a current detection unit electronically connected to the main controller, and a mode switch unit electronically connected to the main controller. The current detection unit cooperates with the main controller in detecting a value of an output current of a power supply circuit. The main controller determines whether the power supply circuit is operating in a discontinuous conduction mode or in a continuous conduction mode according to the value of the output current of the power supply circuit, and controls the mode switch unit to switch the power supply circuit to the continuous conduction mode when the power supply circuit operates in the discontinuous conduction mode.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A power supply control circuit, comprising: a main controller; a current detection unit electronically connected to the main controller, the current detection unit cooperating with the main controller in detecting a value of an output current of a power supply circuit; and a mode switch unit electronically connected to the main controller; wherein the main controller determines whether the power supply circuit is operating in a discontinuous conduction mode or in a continuous conduction mode according to the value of the output current of the power supply circuit, and controls the mode switch unit to switch the power supply circuit to the continuous conduction mode when the power supply circuit operates in the discontinuous conduction mode.
2. The power control circuit of claim 1 , wherein the main controller compares the value of the output current of the power supply circuit with a predetermined limited value, the main controller determines that the power supply circuit operates in the discontinuous conduction mode when the value of the output current is lower than the predetermined limited value; and the main controller determines that the power supply circuit operates in the continuous conduction mode when the value of the output current is higher than the predetermined limited value.
3. The power control circuit of claim 2 , further comprising an input unit electronically connected to the main controller, wherein the input unit inputs the predetermined limited value.
4. The power control circuit of claim 1 , wherein the current detection unit comprises a detection resistor electronically connected to an output terminal of the power supply circuit, and a voltage monitoring chip electronically connected to two terminals of the detection resistor, the voltage monitoring chip detects a value of a voltage cross the detection resistor and outputs the value of the voltage across the detection resistor to the main controller, the main controller calculates the value of the output current according to the capacitance of the detection resistor and the value of the voltage across the detection resistor.
5. The power control circuit of claim 1 , wherein the mode switch unit comprises a metal-oxide-semiconductor field-effect transistor (MOSFET) and a power source, a gate of the MOSFET is electronically connected to the main controller, a source of the MOSFET is grounded, and a drain of the MOSFET is electronically connected to the power source, a node between the power source and the drain of the MOSFET is electronically connected to the power supply circuit; the controller control the switch of the MOSFET, to switch work modes of the power supply circuit accordingly.
6. The power control circuit of claim 1 , further comprising a display electronically connected to the main controller, wherein the display displays the value of the output current, and the determination of the main controller.
7. The power control circuit of claim 6 , further comprising a switch chip electronically connected to the main controller, the display and the current detection unit, wherein the switch chip selectively connects either the display or the current detection unit to the main controller under the control of the main controller.
8. A loop analyzing apparatus, comprising: a power supply circuit; a loop analyzer executing a loop test of the power supply circuit; and a power control circuit controlling the power supply circuit to operate in a continuous conduction mode throughout the loop test, the power control circuit comprising: a main controller; a current detection unit electronically connected to the main controller, the current detection unit cooperating with the main controller in detecting a value of an output current of a power supply circuit; and a mode switch unit electronically connected to the main controller; wherein the main controller determines whether the power supply circuit is operating in a discontinuous conduction mode or a in continuous conduction mode according to the value of the output current of the power supply circuit, and controls the mode switch unit to switch the power supply circuit to the continuous conduction mode when the power supply circuit operates in the discontinuous conduction mode.
9. The loop analyzing apparatus of claim 8 , wherein the main controller compares the value of the output current of the power supply circuit with a predetermined limited value, the main controller determines that the power supply circuit operates in the discontinuous conduction mode when the value of the output current is lower than the predetermined limited value; and the main controller determines that the power supply circuit operates in the continuous conduction mode when the value of the output current is higher than the predetermined limited value.
10. The loop analyzing apparatus of claim 9 , wherein the power control circuit further comprises an input unit electronically connected to the main controller, the input unit inputs the predetermined limited value.
11. The loop analyzing apparatus of claim 8 , wherein the current detection unit comprises a detection resistor electronically connected to an output terminal of the power supply circuit, and a voltage monitoring chip electronically connected to two terminals of the detection resistor, the voltage monitoring chip detects a value of a voltage across the detection resistor and outputs the value of the voltage cross the detection resistor to the main controller, the main controller calculates the value of the output current according to the capacitance of the detection resistor and the value of the voltage across the detection resistor.
12. The loop analyzing apparatus of claim 8 , wherein the mode switch unit comprises a metal-oxide-semiconductor field-effect transistor (MOSFET) and a power source, a gate of the MOSFET is electronically connected to the main controller, a source of the MOSFET is grounded, and a drain of the MOSFET is electronically connected to the power source, a node between the power source and the drain of the MOSFET is electronically connected to the power supply circuit; the controller control the switch of the MOSFET, to switch work modes of the power supply circuit accordingly.
13. The loop analyzing apparatus of claim 8 , wherein the power control circuit further comprises a display electronically connected to the main controller, the display displays the value of the output current, and the determination of the main controller.
14. The loop analyzing apparatus of claim 13 , wherein the power control circuit further comprises a switch chip electronically connected to the main controller, the display and the current detection unit, the switch chip selectively connects either the display or the current detection unit to the main controller under the control of the main controller.
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December 28, 2012
February 17, 2015
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